Messages in this thread | | | Date | Thu, 19 Oct 2023 11:15:32 +0900 | From | Sergey Senozhatsky <> | Subject | Re: Bisected: [PATCH v7 2/8] hugetlb: restructure pool allocations |
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On (23/10/18 15:44), Mike Kravetz wrote: > Hi Sergey, > > Sorry for the delay. Not ignoring your report but chasing this in > another thread.
Hi Mike, no worries.
> https://lore.kernel.org/linux-mm/20231018222003.GA21776@monkey/
Oh, interesting. I just read the article the other day about some of unexpected optimizations that clang can do [1].
Setting h to NULL seems to be fixing the problem for me.
> Quick question. > Are you using LLVM/clang in your builds?
Yes, clang 14.0.6 The kernel compiled with gcc does not BUG_ON().
> My guess is that you are hitting the same issue. That BUG at mm/hugetlb.c:3180 > should not be checked/executed unless you allocate gigantic hugetlb pages on > the kernel command line. Suspect you are not doing this, and loop code is > being run when it should not.
Looks very similar indeed.
[1] https://research.swtch.com/ub
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